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The latch motor has probably failed. You can try using a coat hanger to grab the hook that catches the door and pull it to the left. The only way the oven will work again is to get the latch replaced or to wire the switches on it so the oven control sees that the latch is in the unlocked position. IF you cannot get the door open as mentioned then the whole top will need to come off to access the latch assembly, but that will need to be done anyway as that is the only way to access it.